Input validation error in gotenberg - CVE-2026-40893
Published: May 5, 2026
Vulnerability identifier: #VU129642
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-40893
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: thecodingmachine
Affected software:
gotenberg
gotenberg
Detailed vulnerability description
The vulnerability allows a remote attacker to rename or move files and cause a denial of service.
The vulnerability exists due to improper input validation in the ExifTool metadata tag filtering logic when handling metadata fields in HTTP requests. A remote attacker can send a specially crafted request with group-prefixed tag names to rename or move files and cause a denial of service.
Every endpoint that accepts the metadata field is affected, and ExifTool treats group-prefixed tag names such as System:FileName and System:Directory as equivalent to the blocked bare tag names.
How to mitigate CVE-2026-40893
Install security update from vendor's website.